| Listed in parts books | Not catalogued by year yet |
ENGINE CRANK SPROCKET 20T - PREUNIT TRIUMPH 428
20-tooth crankshaft engine sprocket for pre-unit Triumph twins, sized for 428 primary chain.
This is a 20-tooth engine sprocket for pre-unit Triumph twins, sized for 428 chain. It mounts on the crankshaft and drives the primary chain back to the clutch, so it's a core piece of the primary drive setup on these older engines.
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Because it's a wear item that lives inside the primary chaincase, it's worth checking tooth condition against your primary chain whenever you're in there for other work — a worn sprocket paired with a fresh chain wears the chain out fast, and vice versa.
Our records on this one are thin beyond the basic description, so if you're not sure whether 20T and 428 pitch matches what's currently on your engine, give us a call before you order and we'll help confirm.
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